Die casting machine



Oct 18, 1932 A. P-RosANDER E'r AL 1,882,940

DIE CASTING MACHINE s sheets-sheet 1 Filed April 24. 1930 W 3 |||||U a3.@ "..Hll y www: H2 a y* 3 .MH 3

C- 18, 1932- A. P. rosANDER ET AL 1,832,940

DIE CASTING MACHINE Filed April 24. 1930 5 sheets-smet 2 f w a A www MMV0. in M /f R Aff/V. W

OC- 18, 1932 A. P. RosANDER ET Al. 1,882,940

DIE CASTING' MACHINE Filed April 24. 1930 3 Sheets- Sheet 3 PatentedOct. 18, 1932 UNITED STATES PATENT OFFICE ALBERT PERCY ROSANDER, OFFORESTPARK, AND FRANCIS PETER TIKALSKY, OF

LA GRANGE, ILLINOIS, .ASSIGNORS TO WESTERN ELECTRIC COMPANY, INCOR-PORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW 'YORK DIE cAsTINGMACHINE Application led. April 24,

This invention relates to a die casting machine, and more particularlyto the die charging and casting structure of a die casting machine.

The principal object of the invention is the provision of a die castingmachine arranged With elements operating efficiently and at high speedto produce castings with accuracy and precision.

A feature of the invention is to provide an improved moving andsupporting structure for the charging pot of adie casting machine. l

Another feature of the invention is to provide a self adjusting jointstructure for the compressed air inlet of the charging pot of themachine.

A further feature is to provide improved means for cooling the gatebushing.

Another feature is to provide fluid pressure means for advancing andwithdrawing the casting cores to and from the dies.

A still further feature is to provide a yieldable connector in thestructure for moving the charging pot to afford a resilient engagementof the molten metal conducting nozzle of the pot and the gate of thestationary die plate. i

In accordance with the above object and features, one embodiment ofthe.inventi0n comprises a die casting machine wherein the charging potis positioned within a unitary carrier or receptacle which has aguideway on one side thereof which engages a guide bar for directing thecharging pot in a vertical plane of movement, and an upright yokeadjustably hinged at its bottom to the sides of the casting machinefurnacev pivotally suspendsl the unitary carrier and charging potthereover. A connecting rod and crank reciprocate the carrier and swingthe charging pot upon the upright` yoke down into the furnace to iillthe pot with metal. Aspring pressed ball shaped joint structure isprovided'in the compressed air system for adjustably engaging thecharging pot air nozzle, and apair of compression springs are connectedto the charging pot actuating rod to effect a resilient connection ofthe metal conducting nozzle of the pot with the gate of 1930. serial No.44638124.

the stationary die plate. This gate is protected by a Water cooledbushing having its water passageway extending back and forth along themetal conducting aperture thereof a. plurality of times. The stationarydie is equipped with a pair of oppositely disposed movable cores mountedon its vertical edges and actuated by Huid operated pistons.

A clear understanding of one embodiment of the invention will be hadfrom the following description thereof when taken in connection with theaccompanying drawings, wherein Fig. 1 is a plan view of the die chargingend of a die casting machine;

Fig. 2 is a fragmentary side view of the same end with the charging potin casting position;A

Fig. 3 is a vertical cross-sectional view taken on the line 3 3 of Fig.2;

Fig. 4 is a cross-sectional View of the adjustable joint structure forthe compressed air nozzle of the charging pot;

Fig. 5 is an enlarged elevational view of the yieldable connectorinserted in the charging pot actuating rod, partly shown in section;

Fig. 6 is an enlarged elevational View of the water cooled gate bushing;n

Fig. 7 is an enlarged end view of the gate bushing with the right handend `Cover thereof removed, taken on the line 7 7 of F ig. 6;

Fig. 8 is an enlarged side view of half the symmetrical core actuatingstructure, taken on theline 8 8 of Fig. l;

Fig. 9 is a cross-sectional plan view of this core actuating structure,taken on the line 9 9 of Fig. 8, and

Fig. 10 is a fragmentary side view similar to Fig. 2 but with thecharging pot in a retracted position. f-

Referring now to the drawings wherein like reference numerals designatethe same parts throughout the several views, and particularly to Figs.1, 2 and 3, there is disclosed the die charging end of a die casting ma=chine, in connection with which the invented structure may be used andwhich end comprises a furnace 15 having a melting pot 16, adjacent whichfurnace is supported a stasecured to the die plate 17 and a movable diea web or flange 27 of the charging pot.

19 is mounted on a movable die plate 2O which may be reciprocated bystructure (not shown) to move the die 19 into andpout of engagement withthe die 18 during the casting operation.

The structure for moving and supporting the goose neck charging potautomatic pumpl 23 comprises aunitary carrier or receptacle 24 which hasa pair of side arms 25-25, which with the aid of adjusting screws engageand support a cross rod 26 secured o T e pot is also supported by meansof a lug 28 formed integrally with the back thereof and resting ina'corresponding recess in the carrier 24. A hinge strap 29 bolted to thecarrier 24 secures the lug 28 within this recess. A guideway 3() isformed integrally with one side of the carrier 24. An upright yoke 31 ispivotally bolted to the guideway and to an offsetportion 32 of the hingestrap 29 so that the carrier 24 may swing within thisyoke. The bottom ofthe yoke 31 is pivotally pinned at each lower end thereof to a pair oflinks 33-33 which are pinned to U-shaped brackets 34-34 that are boltedto the sides of the top surface of the `furnace 15. A pair of set screws35-.35 are provided in the ends of each link 33 to engage the topsurface of the furnace 15 for adjusting these links and varyingtheheight of the upright yoke 31. An actuating link 38 is pinned to thecarrier 24 and connects with a crank 39-which is keyed to a cross-shaft40 that is supported by brackets 41-41 `at the end of the furnace. Aguide barv 42 is formed integrally with a collar 43 which is freelyrotatable on the shaft 40, and engages the guideway 30 for directing themovement of the carrier 24 when it is swung upon the yoke 31.

The self adjusting joint structure for the compressed air inlet of thecharging pot 23 (as shown in Fig. 4) consists of a nipple 46 which isreciprocably mounted within a receptacle 47 projecting integrally fromthe stationary die plate 17. A pipe 48 leading from a source ofcompressed air (not shown) is threaded into the nipple 46, and a bushing49 threaded into the receptacle 47 engages a ball shaped portion 50 ofthe nipple for holding it within the receptacle. The goose neckcharging'pot 23 is provided with a cover 51 which is secured by a clamp52 to the lower portion of the charging pot, and this cover has a nozzle53 threaded and locked to the outer end thereof for engaging the nipple50. A coiled spring 54 is mounted within an aperture of the stationarydie plate 17 and engages a plunger 55 which is provided with a sphericalsurface for engaging the ball shaped portion 50 of the nozzle '46, and ascrew 56 forces the spring 54 into engagement with the plunger 55. Withthe joint construction just described the connection between the nozzle53 and the nipple 46 is made adjustable due to the splring 54,andcompensates for an ,wear in t e nozzle or nipple.

The gate ushing which the invention provides comprises (Fig. 6) acentral cylindrical block 59 and two circular end cover plates therefor60 and 61, this gate bushing being disposed within a recess of the"tationary die plate 17 (Fig. 2) opposite a metal conducting nozzlel 62of the charging pot 23. The bushing has a central aperture 64 forconducting metal into the stationary die 18, and inlet and outlet Waterpipes 65 and 66 are threaded into the cover plate 61 and are connectedwith two circulating paths 67 and 68 (Fig. 7). The circulating path 68makes four longitudinal traverses at the left hand side of the block 59parallel to the aperture .64 and then connects with the pipe 66. The

path 67 partially encircles the right hand end of the block 59 and thentraverses the right hand side thereof four times parallel to theaperture 64, whence it connects with a passageway 69 which leads to thepipe 66. It will be understood that the covers 60 and 61 close thereversing or turning portions of the ends'of these two traversing paths67 and 68. It will also be noted that by longitudinally traversing4 thebushing a number of times through the paths just described,.

the circulating water tends to keep the bushing relatively cool.

The core actuating apparatus comprises a pairof shoulders 7 3-73extending integrally from the sides of the stationary die 18, and arectangular horizontally disposed core 74 (Figs. 8 and 9) is slidablymounted in a slot in each of these shoulders. Each core 74 has a collar75 at its outer endfor limiting its inward movement and an innerprojecting portion 76 which cooperates with the movable die 20 to moldor cast a part or casting 77. The cores on both sides of the die areidentical in construction and form identical castings and hence adescription of one answers for a description of the other. In Fig. 9 itwill be noted that the passage of the metal for forming each of thecastings 77, only one of which is shown, since the other is located inthe right half of the die, is through the aperture 64 of the gatebushing 59, where the metal forms a sprue 90, and

the metal is then parted by a conical core 91 secured to the movable die19 and flows into the casting cavities which form the parts 77-77. Acasting rod 78 shouldered at 79 within each of the cores 74 extendsinwardly therefrom for forming a central opening in the cast parts77-77, and a plug 80 is threaded into the core 74 and abuts against theshoulder 79 to hold the rod 78 in position. The plug 80 is provided witha T- shaped head 81 which engages a corresponding slot in the head of apiston rod 82, which pistons 831-83 inwardly or outwardly to. withdrawor force the cores 7 4-7 4, togetherwith the casting rods 78-78 fixedthereto,

into casting position;

The yieldable connector designed vto move the charging pot 23 consistsof two cross plates 93 and 94 (Fig. 5) which are secured respectively toconnecting rods 95 and 96. The rod 95 is connected with the movable dieplate 2O through a reversing gear (not shown), and the rod 96 isadjustably pivoted to a crank 97 which rotates the shaft 40. A pair ofbolts 98-98 provided with washers 99-99 at their right hand ends aresecured to the plate 93 and extend slidably` through apertures in theplates 93 and 94, and coiled compression springs 1GO-100 surround thebolts and extend from the plate 94 to the washers 99-99. Cylinders101-101 are disposedv around the springs between the plate 94 and thewashers 99-99 to limit the amount of compression given the springs. Theconnecting rod 95 is provided with an extension 102 which engages acentral longitudinal cavity in the rod 96 to maintain the two rods i'nalignment. When the rod 95 is moved to the left through its gearreversing connection (not shown) with the plate 20 the plate 93 slidesthe bolts 98-984 through the plate 94 to compress the springs 100-100and thus resiliently drive the rod 96 which rotates the shaft 40,thereby providing a yielding connection between rods 95 and 96.

In the operation of the aforedescribed structures it may at first beassumed that the charging pot 23 is located in the charging posltion, asshown in Figs. 1, 2 and 3. The spring'54 then maintains the nipple 46 inresilient engagement with the air nozzle 53, and the yieldable connectoraforedescribeohincluding the springs 100-100, then maintains the metalconducting nozzle 62 of the charg-` ing pot in resilient engagement withthe gate bushing 59, since the shaft 40 which moves the charging potthrough the intervention of the link 38 is actuated by the connector,and the connector at this time is being pulled to the left-by theconnecting rod 95. When the charging pot is in this charging positionthe dies 18 and 19 come into complete engagen lent with eachother, andthe cores 7 4--74 are moved inwardly preparatory to charging the dies.In order to move the cores inwardl the operator manipulates a handcontrolled fyour-way valye (not shown) which causes water or other fluidto enter' the pi es 87 and exhaust from the pipes 88 connecte to thepistons 84-84, thereby placing the cores in the position shown by thefull lines in Figs. 8

and 9. yCompressed air is then applied under control of a valve (notshown) to the pipe 48 connecting with the air nozzle 53, forcing moltenmetalv from the charging pot 23 into the dies as shown in Figs. 8 and 9,to cast the parts 7 7--77 The cores 7 4-74 are next withdrawn, or movedto the position shown in dot and dash outline in Fig. 8, by applyingluid pressure to the pipes 88-88, whereupon the castings are ejected orremoved. In the operation of the cores 74-7 4 it will be understood thatthe pistons 83-83 are simultaneously actuated by the uid pressure, sinceboth pistons are connected to the same controlling valve, and it will benoted that such fluid pressure operation readily serves the purpose ofwithdrawing the cores.

The next step in the operation is the lowering and refilling of the pot23 with metal, and this is accomplished by means of the connecting rod96 which is moved to the right as the die plate 20 moves to the left inseparating the dies. The aforementioned reversing gear (not shown)disposed between the die plate 20 and the rod 96 moves the rod 95 to theright as the die 20 is withdrawn from the die.

19. The rod 95 then forces the connector plate 93 against the plate 94and forces the rod 96 to the right, rotating the shaft 40 in acounter-clockwisel direction and pulling the link 38 downwardly. Thelink 38 swings the charging pot carrier 24 in a counterclockwisedirection upon its ivot points in the yoke 31, and swings the yo e 31 ina clockwise direction about its lower pivot points. o Thus because thecharging pot carrier 24 swin within the yoke andthe yoke tilts to therig t the charging pot 23 is lowered, and is refilled in the melting pot16 by molten metal entering the nozzle 62 (Fig. 10). In raising thecharging pot to the charging position shown, the connecting rod 95 ismoved to the left when the die 19 moves to the right for charging,andthe link 38 causes the carrier 24 to pivot within the yoke 31 andmoves the yoke 31 to the upright position shown.

It will be understood, of course, that the invention is not to belimited by the specic embodiment herein described and illustrated, butis to be limited only by the scope of the appended claim.

What is claimed is:

In a die casting machine,\a furnace having a melting pot, a unitaryinverted U- shaped supporting member having spaced arms hinged at theirlower ends upon the furnace on opposite sides of the melting pot, acarrier pivotally supported at opposite sides upon said arms and havinga U-shaped portion, a charging pot supported at three points upon saidU-shaped portion ofthe carrier,

means for swinging the carrier and thereby the supporting member to movethe charging pot into and out of the melting pot, an guiding means forcausing e predetermined relative movement between the carrier and thesupporting member during the movement of the carrier.

In witness whereof, we hereunto subscribe our names this 15th day ofApril, A. D. 1930.

ALBERT PERCY ROSANDER. FRANCIS PETER TIKALSKY.

